Data Driven Subscription Error: Bad Email

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I want to find out the Bad Emails in the Data Driven Subscriptions. I get the emails from the database via a query and the subscription is sent to those emails. This is the Status: Done: 100 processed of 100 total; 4 errors. This is the error message in Log file: e ERROR: Error sending email. System.Runtime.InteropServices.COMException (0x8004020F): The server rejected one or more recipient addresses. The server response was: 550 5.1.1 User unknown